Bri*_*ung 4 camera file save dart flutter
我不知道如何保存到相机胶卷（相当于 React Native 的CameraRoll saveToCameraRoll().
Flutter 相机推荐使用path_provider获取应用程序目录，但它似乎没有获取相机胶卷目录路径的选项。
我得到了一个例外 CameraController.capture
相关的变化（只有相关的变化，以差异的形式）在这里：https : //gist.github.com/briankung/45f9d8438baab59ddcd3b6f3fe811d99
我的全部main.dart内容如下，以便于重现（搜索QUESTION:以找到相关部分）：
import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:camera/camera.dart';
import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
List<CameraDescription> cameras;
Future<Null> main() async {
SystemChrome.setPreferredOrientations([
DeviceOrientation.portraitUp,
DeviceOrientation.portraitDown
]);
cameras = await availableCameras();
runApp(new CameraApp());
}
class CameraApp extends StatefulWidget {
@override
_CameraAppState createState() => new _CameraAppState();
}
class _CameraAppState extends State<CameraApp> {
String _appDirectoryPath;
CameraController controller;
Future<void> _requestAppDirectory() async {
// QUESTION: `path_provider` doesn't have getCameraRollDirectory()
Directory _appDirectory = await getApplicationDocumentsDirectory();
setState(() {
_appDirectoryPath = _appDirectory.path;
});
}
@override
void initState() {
super.initState();
_requestAppDirectory();
controller = new CameraController(cameras[0], ResolutionPreset.medium);
controller.initialize().then((_) {
if (!mounted) {
return;
}
setState(() {});
});
}
@override
void dispose() {
controller?.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
if (!controller.value.initialized) {
return new Container();
}
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.red,
),
home: new Scaffold(
body: new Center(
child: new AspectRatio(
aspectRatio: controller.value.aspectRatio,
child: new CameraPreview(controller),
),
),
floatingActionButton: new FloatingActionButton(
tooltip: 'Increment',
child: new Icon(Icons.camera),
onPressed: () {
print('capturing');
print(_appDirectoryPath);
// QUESTION: this errors out
controller.capture(_appDirectoryPath);
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
),
);
}
}
日志信息如下：
I/flutter ( 5471): capturing
I/flutter ( 5471): /data/user/0/com.example.mycameraapp/app_flutter
W/LegacyRequestMapper( 5471): convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
I/RequestThread-0( 5471): Received jpeg.
I/RequestThread-0( 5471): Producing jpeg buffer...
W/LegacyRequestMapper( 5471): convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
W/LegacyRequestMapper( 5471): Only received metering rectangles with weight 0.
E/flutter ( 5471): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter ( 5471): CameraException(IOError, Failed saving image)
E/flutter ( 5471): #0 CameraController.capture (package:camera/camera.dart:234:7)
E/flutter ( 5471): <asynchronous suspension>
E/flutter ( 5471): #1 _CameraAppState.build.<anonymous closure> (file:///Users/briankung/workspace/mobile/flutter/my_camera_app/lib/main.dart:84:24)
E/flutter ( 5471): #2 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:478:14)
E/flutter ( 5471): #3 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:530:30)
E/flutter ( 5471): #4 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter ( 5471): #5 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:161:9)
E/flutter ( 5471): #6 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:123:7)
E/flutter ( 5471): #7 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
E/flutter ( 5471): #8 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:147:20)
E/flutter ( 5471): #9 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:121:22)
E/flutter ( 5471): #10 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:101:7)
E/flutter ( 5471): #11 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:64:7)
E/flutter ( 5471): #12 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:48:7)
E/flutter ( 5471): #13 _invoke1 (dart:ui/hooks.dart:134:13)
E/flutter ( 5471): #14 _dispatchPointerDataPacket (dart:ui/hooks.dart:91:5)
I/RequestQueue( 5471): Repeating capture request cancelled.
谢谢！
忘记版本号：
$ flutter --version
Flutter 0.2.8 • channel beta • https://github.com/flutter/flutter.git
Framework • revision b397406561 (10 days ago) • 2018-04-02 13:53:20 -0700
Engine • revision c903c217a1
Tools • Dart 2.0.0-dev.43.0.flutter-52afcba357
// pubspec.yaml
camera:
dependency: "direct main"
description:
name: camera
url: "https://pub.dartlang.org"
source: hosted
version: "0.1.2"
path_provider:
dependency: "direct main"
description:
name: path_provider
url: "https://pub.dartlang.org"
source: hosted
version: "0.4.0"
您可以使用pub.dev/packages/gallery_saver中的gallery_saver，它将视频和图像保存在适用于 Android 和 iOS 的画廊/照片中。
您只需要为它提供一个文件或 url 的临时路径，它就会保存本地文件和来自网络的文件。
这是它的使用方式：
GallerySaver.saveVideo(String path);
GallerySaver.saveImage(String path);
这两个函数在成功保存案例文件时返回 true，在任何其他方式中返回 false。
我的团队开发了这个插件。
不幸的是，我认为 flutter 目前还没有公开此功能。
您最好的选择可能是编写一个插件或使用Platform Channels它来执行此操作。您可以像本示例中那样使用临时目录，然后将路径传递给 android，您将在其中读取文件并将其插入到库中，如下所示：
MediaStore.Images.Media.insertImage(
getContentResolver(),
yourBitmap,
yourTitle ,
yourDescription
);`
如果您在某个 flutter 存储库中创建功能请求，并且有人决定通过为您编写插件来帮助您，那么您可能会很幸运。